Coding style clarification on short array syntax

People (including me) are really starting to use the short array syntax. I don't really want to start this discussion, but unfortunately, we are also seeing examples of inconsistent code like:

$foo = ['item'];

// not many lines..

$bar = array('foo', 'bar', 'baz');

$baz = array(['foo' => 'bar'], ['baz']);

I see that drupal have faced this issue and discussed it extensively too:
https://www.drupal.org/node/2135291

They have a section in their coding style which I think we should adopt something similar:

The use of PHP 5.4+ short array syntax for Drupal 8.x is being discussed and is used in some patches already. When used, try to apply it consistently to at least a whole method or function.

Looks like phpcs has a fixer for it, so thats an extremely invasive option to go wholesale into it.